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This CL adds document_policy_features.h/.cc where all document policy
features can be retrieved. document_policy_features are in blink/common
directory because the serialization of document policy on browser side
needs feature to name mapping.

Change-Id: I850c6c9c008174ee39d89f60962cee5d30a639a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014149
Commit-Queue: Charlie Hu <chenleihu@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737172}